- Two using ways: Hold in hand and place on desktop<br />- With left/right clicker、 optical trackball and scroll wheel<br />- 2.4GHz、 working distance within 10 meters<br />- Plug and play<br />- Built-in rechargeable battery、 working time up to 20 hours (3-4 hours charging)<br />- Come with a charging USB cable and USB receiver<br />                                                                                                                                Dimensions: 4.13 in x 2.05 in x 1.81 in (10.5 cm x 5.2 cm x 4.6 cm)<br />Weight: 6.38 oz (181 g)